Ok, in the spending PP section of the psychic rules, the text and the example they give for strengthening a power give two different results. Which is correct?

If you want to improve a specific power, say Psychokenetic Armor, does it cost 1 PP per +10, up to 5 for +50? Or does it cost something else (because the text says the most you can spend on a single power is 10... which makes no sense)?

I assume its 1 per +10 because that would stick with the cost of increasing all of them (1+2+3+4 etc) and make it a nice option if you want to specialize.

Is it clearer in one of the other versions?

There is a typo but I do not know for sure which it is supposed to be. 1PP does give +10 per, however I am now if the maximum is +50 allowing 5PP or +100 allowing 10PP invested I do not know for sure. However, due to both Improve Psychic Projection and Increase Psychic Potential both being limited to 5PP per use, it makes sense that 5PP is the max that can be used to Strengthen a Power. I would say +50 max with 5PP invested is what it is supposed to say.

Sorry I can't be of better help.

the way lia stated is how my GM rules it, if that helps.